CN111193415B - Fault-tolerant traction converter main circuit of high-speed train - Google Patents
Fault-tolerant traction converter main circuit of high-speed train Download PDFInfo
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- CN111193415B CN111193415B CN202010151724.1A CN202010151724A CN111193415B CN 111193415 B CN111193415 B CN 111193415B CN 202010151724 A CN202010151724 A CN 202010151724A CN 111193415 B CN111193415 B CN 111193415B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/443—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means
- H02M5/45—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M5/4505—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only having a rectifier with controlled elements
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Abstract
The invention discloses a fault-tolerant traction converter main circuit of a high-speed train, which relates to the technical field of electric locomotive traction and comprises a four-quadrant pulse rectifier, a middle direct current circuit, an inverter, a redundant circuit and a fault isolation component which are sequentially connected in series, wherein the four-quadrant pulse rectifier is of a single-phase three-level T-shaped pulse rectifier topological structure; the inverter is of a three-phase three-level T-type inverter topological structure; the fault isolation components are distributed in the four-quadrant pulse rectifier and the bridge arm of the inverter; the redundant circuit is electrically connected with the four-quadrant pulse rectifier, the intermediate direct current circuit and the inverter. The invention can realize fault isolation and multi-mode fault-tolerant operation, not only can be used for fault tolerance of open-circuit and short-circuit faults of single or multiple switching tubes, but also can be used for fault tolerance of open-circuit and short-circuit faults of bridge arms, thereby improving the reliability of a traction converter system, and has simple structure, low conduction loss and high output electric energy quality.
Description
Technical Field
The invention relates to the technical field of electric locomotive traction, in particular to a fault-tolerant traction converter main circuit of a high-speed train.
Background
The high-speed train traction system mainly comprises a traction transformer, a traction converter (rectifier, inverter and intermediate DC link), a traction motor and a traction transmission control system. The traction converter is a core component of a traction system, and has the advantages of high power density, high efficiency, high performance and high reliability, which are all the time the core requirements of technical development and innovation.
The high-speed train of the motor train unit is a large and complex strong electromechanical coupling system, and as a core component, the reliability of power devices in a traction converter (a four-quadrant pulse rectifier and a PWM inverter) is far lower than that of other electromechanical devices of the traction system due to frequent switching actions. Faults of the four-quadrant pulse rectifier, the PWM inverter and the traction control unit are main factors of faults of the traction converter of the high-speed train, and the accumulated fault rate is 92.5%. Therefore, there is a need to develop a traction converter main circuit with strong fault tolerance and high reliability.
Disclosure of Invention
The invention aims to provide a fault-tolerant traction converter main circuit of a high-speed train, which can alleviate the problems.
In order to alleviate the problems, the technical scheme adopted by the invention is as follows:
the main circuit body comprises a four-quadrant pulse rectifier, a middle direct current circuit and an inverter which are sequentially connected in series, wherein the four-quadrant pulse rectifier is of a single-phase three-level T-type pulse rectifier topological structure; the inverter is of a three-phase three-level T-type inverter topological structure; the fault isolation components are distributed in the four-quadrant pulse rectifier and the bridge arm of the inverter; the redundant circuit is electrically connected with the four-quadrant pulse rectifier, the intermediate direct current circuit and the inverter.
Further, the fault isolation component is a plurality of fuses.
Further, the four-quadrant pulse rectifier comprises two three-level T-shaped bridge arms, wherein each three-level T-shaped bridge arm comprises an upper bridge arm, a lower bridge arm and a transverse bridge arm;
the upper bridge arm of the four-quadrant pulse rectifier comprises a switch tube S a1 Fast fuse F ap Switch tube S b1 Fast fuse F bp Wherein the switching tube S a1 Collector of (d) and fast fuse F ap One end is connected with a quick fuse F ap The other end of the switch tube S is connected to the end of the positive direct current bus P a1 The emitter of (a) is connected to the A end of the single-phase alternating current bus, and the switch tube S b1 Collector of (d) and fast fuse F bp Is connected with one end of a fast fuse F bp The other end of the switch tube S is connected to the end of the positive direct current bus P b1 The emitter of (a) is connected to the B end of the single-phase alternating current bus;
the lower bridge arm of the four-quadrant pulse rectifier comprises a switch tube S a4 Fast fuse F an Switch tube S b4 Fast fuse F bn Wherein the switching tube S a4 The collector of (a) is connected to the A end of the single-phase alternating current bus, and the switch tube S a4 Emitter and fast fuse F of (2) an Is connected with one end of a fast fuse F an The other end of the switch tube S is connected to the N end of the negative direct current bus b4 The collector of (2) is connected to the B end of the single-phase alternating current bus, and the switch tube S b4 Emitter and fast fuse F of (2) bn Is connected with one end of a fast fuse F bn The other end of the negative direct current bus is connected to the N end of the negative direct current bus;
the transverse bridge arm of the four-quadrant pulse rectifier comprises a switching tube S a2 Fast fuse F ao Switch tube S a3 Switch tube S b2 Switch tube S b3 Fast fuse F bo Wherein the switching tube S a2 Emitter and fast fuse F of (2) ao Is connected with one end of a fast fuse F ao The other end of the switch tube S is connected to the A end of the single-phase alternating current bus a2 Collector and switching tube S of (2) a3 Collector connection of (S) switch tube a3 The emitter of (2) is connected to the middle point O of the DC bus, and the switch tube S b2 Emitter and fast fuse F of (2) bo Is connected with one end of a fast fuse F bo The other end of the switch tube S is connected to the B end of the single-phase alternating current bus b2 Collector and switching tube S of (2) b3 Collector connection of (S) switch tube b3 The emitter of (a) is connected to the middle point O of the direct current bus;
the fast fuse F ap Said fast fuse F bp Said fast fuse F an Said fast fuse F bn Said fast fuse F ao The fast fuse F bo Are included in the fault isolation assembly.
Further, the inverter comprises three-level T-shaped bridge arms, wherein each three-level T-shaped bridge arm comprises an upper bridge arm, a lower bridge arm and a transverse bridge arm;
the upper bridge arm of the inverter comprises a switch tube S u1 Fast fuse F up Switch tube S v1 Fast fuse F vp Switch tube S w1 Fast fuse F wp Wherein the switching tube S u1 Collector of (d) and fast fuse F up Is connected with one end of a fast fuse F up The other end of the switch tube S is connected to the end of the positive direct current bus P u1 The emitter of (a) is connected to the three-phase alternating current output U end, and the switch tube S v1 Collector of (d) and fast fuse F vp Is connected with one end of a fast fuse F vp The other end of the switch tube S is connected to the end of the positive direct current bus P v1 The emitter of (2) is connected to the three-phase alternating current output V end, and the switch tube S w1 Collector of (d) and fast fuse F wp Is connected with one end of a fast fuse F wp The other end of the switch tube S is connected to the end of the positive direct current bus P w1 The emitter of (a) is connected to the W end of the three-phase alternating current output;
the lower bridge arm of the inverter comprises a switch tube S u4 Fast fuse F un Switch tube S v4 Fast fuse F vn Switch tube S w4 Fast fuse F wn Wherein the switching tube S u4 The collector of (2) is connected to the three-phase alternating current output U end, and the switch tube S u4 Emitter and fast fuse F of (2) un Is connected with one end of a fast fuse F un The other end of the switch tube S is connected to the N end of the negative direct current bus v4 The collector of (2) is connected to the three-phase AC output V terminal, the switch tube S v4 Emitter and fast fuse F of (2) vn Is connected with one end of a fast fuse F vn The other end of the switch tube S is connected to the N end of the negative direct current bus w4 The collector of (2) is connected to the three-phase AC output W end, and the switch tube S w4 Emitter and fast fuse F of (2) wn Is connected with one end of a fast fuse F wn The other end of the negative direct current bus is connected to the N end of the negative direct current bus;
the transverse bridge arm of the inverter comprises a switch tube S u2 Fast fuse F uo Switch tube S u3 Fast fuse F vo Switch tube S v2 Switch tube S v3 Switch tube S w2 Switch tube S w3 Fast fuse F wo Wherein the switching tube S u2 Emitter and fast fuse F of (2) uo Is connected with one end of a fast fuse F uo The other end of the switch tube S is connected to the three-phase alternating current output U end u2 Collector and switching tube S of (2) u3 Is connected with the collector of the switch tube S u3 The emitter of (2) is connected to the middle point O of the DC bus, and the switch tube S v2 Emitter and fast fuse F of (2) vo Is connected with one end of a fast fuse F vo The other end of the switch tube S is connected to the three-phase alternating current output V end v2 Collector and switching tube S of (2) v3 Is connected with the collector of the switch tube S v3 The emitter of (2) is connected to the middle point O of the DC bus, and the switch tube S w2 Emitter and fast fuse F of (2) wo Is connected with one end of a fast fuse F wo The other end of the switch tube S is connected to the three-phase alternating current output W end w2 Collector and switching tube S of (2) w3 Collector connection of (S) switch tube w3 The emitter of (a) is connected to the middle point O of the direct current bus;
the fast fuse F up Said fast fuse F vp Said fast fuse F wp Said fast fuse F un Said fast fuse F vn Said fast fuse F wn Said fast fuse F uo Said fast fuse F vo And the fast fuse F wo Including the fault isolation assembly.
Further, the intermediate DC circuit comprises two electrolytic capacitors C connected in series d1 、C d2 Electrolytic capacitor C d1 The positive terminal of (C) is connected with the positive DC bus P terminal, and the electrolytic capacitor C d1 The negative polarity end of (C) is connected to the middle point O of the direct current bus, and the electrolytic capacitor C d2 The positive terminal of (2) is connected to the middle point O of the direct current bus, and the electrolytic capacitor C d2 Is connected with the negative polarity end of the negative direct current bus N.
Still further, the redundant circuit includes a single-phase redundant bridge arm, a rectifying-side fault-tolerant bridge, and an inverting-side fault-tolerant bridge.
Further, the single-phase redundant bridge arm is of a three-level T-shaped topological structure and comprises a switching tube S 1 Switch tube S 2 Switch tube S 3 Switch tube S 4 The switch tube S 1 The collector electrode of the switch tube S is connected with the P end of the positive direct current bus 1 Emitter and switching tube S of (C) 4 Collector and switching tube S 2 Emitter connection, switch tube S 4 The emitter of the switch tube S is connected with the N end of the negative direct current bus 2 Collector and switching tube S of (2) 3 Collector connection of (S) switch tube 3 Is connected to the middle point O of the dc bus.
Further, the rectifying side fault-tolerant bridge comprises a bidirectional controllable thyristor T a And a bidirectional controllable thyristor T b Bidirectional controllable thyristor T a One end of the (B) is connected to the A end of the single-phase alternating current bus, and the bidirectional controllable thyristor T b Is connected to the B end of the single-phase alternating current bus, and is a bidirectional controllable thyristor T a Is provided with a bidirectional controllable thyristor T b The other ends of (a) are connected to a switch tube S 1 Is provided.
Further, the inverter-side fault-tolerant bridge comprises a bidirectional controllable thyristor T u Bidirectional controllable thyristor T v And a bidirectional controllable thyristor T w The bidirectional controllable thyristor T u One end of the bidirectional controllable thyristor T v One end of the bidirectional controllable thyristor T w Is connected to the switch tube S at one end 1 The emitter of the bidirectional controllable thyristor T u Is arranged at the other end of the bidirectional controllable thyristor T v Is arranged at the other end of the bidirectional controllable thyristor T w The other end of the three-phase alternating current output circuit is respectively connected to a three-phase alternating current output U end, a three-phase alternating current output V end and a three-phase alternating current output W end.
The beneficial effects of the invention are as follows:
1) The fault-tolerant traction converter main circuit of the high-speed train can realize fault isolation and multi-mode fault-tolerant operation, not only can be tolerant to open-circuit and short-circuit faults of a single or a plurality of switching tubes, but also can be tolerant to open-circuit and short-circuit faults of bridge arms, thereby improving the reliability of a traction converter system and further improving the operation reliability of the high-speed train;
2) The three-level T-type converter is an improved topology of a three-level diode clamp-type converter, and has the advantages of simple structure, low conduction loss and high output electric energy quality.
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a fault tolerant traction system in an embodiment;
FIG. 2 is a schematic diagram of a fault tolerant traction converter main circuit with redundant circuitry removed in an embodiment;
FIG. 3 is a schematic diagram of a fault tolerant traction converter redundancy circuit in an embodiment;
FIG. 4 is a flow chart of a general scheme for high-speed rail traction drive;
FIG. 5 is a fault tolerant operation control flow diagram;
FIG. 6 is a fault tolerant control result under an inverter vertical leg switching tube fault;
fig. 7 is a fault-tolerant control result under the fault of the switching tube of the inverter cross arm.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1, the present embodiment provides a main circuit of a fault-tolerant traction converter of a high-speed train, which includes a main circuit body 1, a redundancy circuit 2 and a fault isolation component 3, wherein the main circuit body 1 includes a four-quadrant pulse rectifier 11, an intermediate dc circuit 12 and an inverter 13, which are sequentially connected in series, and the four-quadrant pulse rectifier 11 is a single-phase three-level T-type pulse rectifier topology; the inverter 13 is a three-phase three-level T-type inverter topological structure; the fault isolation components 3 are distributed in the bridge arms of the four-quadrant pulse rectifier 11 and the inverter 13; the redundancy circuit 2 is electrically connected to the four-quadrant pulse rectifier 11, the intermediate dc circuit 12 and the inverter 13. The fault-tolerant traction converter main circuit of the high-speed train according to the embodiment is connected with a traction transformer and four traction motors according to the illustration of fig. 1 when in use.
In the present embodiment, the fault isolation assembly 3 is a fast fuse connected in series in the leg of the main circuit body 1.
Referring to fig. 2, in the present embodiment, the four-quadrant pulse rectifier 11 includes two three-level T-shaped legs, wherein the three-level T-shaped legs include an upper leg, a lower leg, and a transverse leg;
the upper bridge arm of the four-quadrant pulse rectifier 11 comprises a switching tube S a1 Fast fuse F ap Switch tube S b1 Fast fuse F bp Wherein the switching tube S a1 Collector of (d) and fast fuse F ap One end is connected with a quick fuse F ap The other end of the switch tube S is connected to the end of the positive direct current bus P a1 The emitter of (a) is connected to the A end of the single-phase alternating current bus, and the switch tube S b1 Collector of (d) and fast fuse F bp Is connected with one end of a fast fuse F bp The other end of the switch tube S is connected to the end of the positive direct current bus P b1 The emitter of (a) is connected to the B end of the single-phase alternating current bus;
the lower bridge arm of the four-quadrant pulse rectifier 11 comprises a switching tube S a4 Fast fuse F an Switch tube S b4 Fast fuse F bn Wherein the switching tube S a4 The collector of (a) is connected to the A end of the single-phase alternating current bus, and the switch tube S a4 Emitter and fast fuse F of (2) an Is connected with one end of a fast fuse F an The other end of the switch tube S is connected to the N end of the negative direct current bus b4 The collector of (2) is connected to the B end of the single-phase alternating current bus, and the switch tube S b4 Emitter and fast fuse F of (2) bn Is connected with one end of a fast fuse F bn The other end of the negative direct current bus is connected to the N end of the negative direct current bus;
the cross arm of the four-quadrant pulse rectifier 11 comprises a switching tube S a2 Fast fuse F ao Switch tube S a3 Switch tube S b2 Switch tube S b3 Fast fuse F bo Wherein the switching tube S a2 Emitter and fast fuse F of (2) ao Is connected with one end of a fast fuse F ao The other end of the switch tube S is connected to the A end of the single-phase alternating current bus a2 Collector and switching tube S of (2) a3 Collector connection of (S) switch tube a3 The emitter of (2) is connected to the middle point O of the DC bus, and the switch tube S b2 Emitter and fast fuse F of (2) bo Is connected with one end of a fast fuse F bo The other end of the switch tube S is connected to the B end of the single-phase alternating current bus b2 Collector and switching tube S of (2) b3 Collector connection of (S) switch tube b3 The emitter of (a) is connected to the middle point O of the direct current bus;
quick fuse F ap Fast fuse F bp Fast fuse F an Fast fuse F bn Fast fuse F ao Fast fuse F bo Are included in the fault isolation assembly 3.
During traction working conditions, a traction winding of a traction transformer of the high-speed train outputs 1500V/50Hz single-phase alternating current, the single-phase alternating current is converted into 2600V-3000V direct current through a four-quadrant pulse rectifier 11, and the direct current is regulated according to an actual speed range, so that unit power factor control of primary side voltage and current of the traction transformer is realized; in the regenerative braking mode, the pulse rectifier is operated in an inverted state, and AC 1500V/50Hz is output to the AC side of the rectifier with the support capacitor output voltage DC 3000V of the intermediate DC circuit 12 as an input.
Referring to fig. 2, in the present embodiment, the intermediate dc circuit 12 includes two electrolytic capacitors C connected in series d1 、C d2 For supplying a stable dc voltage to the inverter 13. Electrolytic capacitor C d1 The positive terminal of (C) is connected with the positive DC bus P terminal, and the electrolytic capacitor C d1 The negative polarity end of (C) is connected to the middle point O of the direct current bus, and the electrolytic capacitor C d2 The positive terminal of (2) is connected to the middle point O of the direct current bus, and the electrolytic capacitor C d2 Is connected with the negative polarity end of the negative direct current bus N. Before the inverter 13 is put into operation, the electrolytic capacitor of the intermediate dc circuit 12 is charged by the bus dc source.
Referring to fig. 2, in the present embodiment, the inverter 13 includes three-level T-shaped legs, including an upper leg, a lower leg, and a transverse leg;
the upper leg of the inverter 13 comprises a switching tube S u1 Fast fuse F up Switch tube S v1 Fast fuse F vp Switch tube S w1 Fast fuse F wp Wherein the switching tube S u1 Collector of (d) and fast fuse F up Is connected with one end of a fast fuse F up The other end of the switch tube S is connected to the end of the positive direct current bus P u1 The emitter of (a) is connected to the three-phase alternating current output U end, and the switch tube S v1 Collector of (d) and fast fuse F vp Is connected with one end of a fast fuse F vp The other end of the switch tube S is connected to the end of the positive direct current bus P v1 The emitter of (2) is connected to the three-phase alternating current output V end, and the switch tube S w1 Collector of (d) and fast fuse F wp Is connected with one end of a fast fuse F wp The other end of the switch tube S is connected to the end of the positive direct current bus P w1 The emitter of (a) is connected to the W end of the three-phase alternating current output;
the lower leg of the inverter 13 comprises a switching tube S u4 Fast fuse F un Switch tube S v4 Fast fuse F vn Switch tube S w4 Fast fuse F wn Wherein the switching tube S u4 The collector of (2) is connected to the three-phase alternating current output U end, and the switch tube S u4 Emitter and fast fuse F of (2) un Is connected with one end of a fast fuse F un The other end of the switch tube S is connected to the N end of the negative direct current bus v4 The collector of (2) is connected to the three-phase AC output V terminal, the switch tube S v4 Emitter and fast fuse F of (2) vn Is connected with one end of a fast fuse F vn The other end of the switch tube S is connected to the N end of the negative direct current bus w4 The collector of (2) is connected to the three-phase AC output W end, and the switch tube S w4 Emitter and fast fuse F of (2) wn Is connected with one end of a fast fuse F wn The other end of the negative direct current bus is connected to the N end of the negative direct current bus;
the lateral leg of the inverter 13 comprises a switching tube S u2 Fast fuse F uo Switch tube S u3 Fast fuse F vo Switch tube S v2 Switch tube S v3 Switch tube S w2 Switch tube S w3 Fast fuse F wo Wherein the switching tube S u2 Emitter and fast fuse F of (2) uo Is connected with one end of a fast fuse F uo The other end of the switch tube S is connected to the three-phase alternating current output U end u2 Collector and switching tube S of (2) u3 Is connected with the collector of the switch tube S u3 The emitter of (2) is connected to the middle point O of the DC bus, and the switch tube S v2 Emitter and fast fuse F of (2) vo Is connected with one end of a fast fuse F vo The other end of the switch tube S is connected to the three-phase alternating current output V end v2 Collector and switching tube S of (2) v3 Is connected with the collector of the switch tube S v3 Is connected to the middle point of the direct current busO point, switch tube S w2 Emitter and fast fuse F of (2) wo Is connected with one end of a fast fuse F wo The other end of the switch tube S is connected to the three-phase alternating current output W end w2 Collector and switching tube S of (2) w3 Collector connection of (S) switch tube w3 The emitter of (a) is connected to the middle point O of the direct current bus;
quick fuse F up Fast fuse F vp Fast fuse F wp Fast fuse F un Fast fuse F vn Fast fuse F wn Fast fuse F uo Fast fuse F vo And a fast fuse F wo Included in the fault isolation assembly 3.
During traction working conditions, the inverter 13 takes the capacitor voltage of the intermediate direct current circuit 12 as input, adopts a traction transmission control system to control the on and off of a power device, outputs three-phase alternating current with adjustable voltage and frequency, and controls the rotating speed and torque of four traction motors; in the regenerative braking mode, the three-phase ac power output from the traction motor is used as an input, and a dc voltage is output to the intermediate dc circuit 12.
Referring to fig. 3, the redundancy circuit 2 includes a single-phase redundancy bridge arm 21, a rectification-side fault-tolerant bridge 22, and an inversion-side fault-tolerant bridge 23.
The single-phase redundant bridge arm 21 is of a three-level T-shaped topological structure and comprises a switching tube S 1 Switch tube S 2 Switch tube S 3 Switch tube S 4 Switch tube S 1 The collector electrode of the switch tube S is connected with the P end of the positive direct current bus 1 Emitter and switching tube S of (C) 4 Collector and switching tube S 2 Emitter connection, switch tube S 4 The emitter of the switch tube S is connected with the N end of the negative direct current bus 2 Collector and switching tube S of (2) 3 Collector connection of (S) switch tube 3 Is connected to the middle point O of the dc bus.
Under normal working conditions, the bidirectional controllable thyristors in the rectifying side fault-tolerant bridge 22 and the inverting side fault-tolerant bridge 23 are in an off state, and the single-phase redundant bridge arm 21 is in an isolated state. When one phase of the multi-switch tube in the rectifying side fault-tolerant bridge 22 or the inverting side fault-tolerant bridge 23 fails and the fault tolerance cannot be carried out by utilizing the self redundancy, the corresponding bidirectional controllable thyristors are controlled to be conducted, and a single-phase redundant bridge arm is put into place of the fault bridge arm.
The rectifying side fault-tolerant bridge 22 comprises a bidirectional thyristor T a And a bidirectional controllable thyristor T b Bidirectional controllable thyristor T a One end of the (B) is connected to the A end of the single-phase alternating current bus, and the bidirectional controllable thyristor T b Is connected to the B end of the single-phase alternating current bus, and is a bidirectional controllable thyristor T a Is provided with a bidirectional controllable thyristor T b The other ends of (a) are connected to a switch tube S 1 Is provided. Under normal working conditions, the two-way controllable thyristors of the rectifying side fault-tolerant bridge 22 are all in an off state, and when a certain phase bridge arm of the four-quadrant pulse rectifier 11 fails and can not perform fault-tolerant operation through self redundancy, the corresponding thyristors T are controlled a Or T b On, the fault bridge arm is replaced by a single-phase redundant bridge arm 21.
The inverter-side fault-tolerant bridge 23 comprises a bidirectional thyristor T u Bidirectional controllable thyristor T v And a bidirectional controllable thyristor T w Bidirectional controllable thyristor T u One end of a bidirectional controllable thyristor T v One end of a bidirectional controllable thyristor T w Is connected to the switch tube S at one end 1 Is a bidirectional controllable thyristor T u Is provided with a bidirectional controllable thyristor T v Is provided with a bidirectional controllable thyristor T w The other end of the three-phase alternating current output circuit is respectively connected to a three-phase alternating current output U end, a three-phase alternating current output V end and a three-phase alternating current output W end. Under normal working conditions, three groups of bidirectional controllable thyristors of the inversion-side fault-tolerant bridge 23 are all in an off state, and when a certain phase bridge arm of the inverter 13 fails and fault tolerance cannot be carried out through self redundancy, the corresponding thyristors T are controlled u 、T v Or T w And a single-phase redundant bridge arm 21 is put into conduction to replace a fault bridge arm.
When the fault-tolerant traction converter main circuit of the high-speed train is applied to high-speed rail traction transmission, a general scheme flow chart of the high-speed rail traction transmission is shown in fig. 4, and the control steps are as follows:
A. according to the vehicle-mounted information control system, acquiring the vehicle state and a traction instruction in real time, and sending the vehicle state and the traction instruction to a traction transmission control unit;
B. the working state of the traction converter is obtained through a state online monitoring system, and the running mode (normal mode or fault-tolerant mode) of the converter is determined;
C. and controlling the on and off of the corresponding power switch tube according to the operation mode of the converter, so as to output expected three-phase alternating current to drive the traction motor to operate, and simultaneously feeding back the operation information of the converter to a traction transmission control system.
As shown in fig. 5, the fault-tolerant control flow chart of the fault-tolerant traction converter main circuit of the high-speed train according to the invention comprises the following specific fault-tolerant operation steps:
1) The running state of the converter is monitored in real time through a fault on-line monitoring system, and when faults of the power switch tube are detected and positioned, the four-quadrant pulse rectifier 11 and the inverter 13 are controlled to be switched to corresponding fault-tolerant running modes according to different fault modes;
2) When detecting the single bridge arm switch tube S of the four-quadrant pulse rectifier 11 x2 、S x3 The switching tube S in the phase transverse bridge arm is immediately turned off when a fault occurs x2 And S is x3 The trigger pulse signals of the bridge arm are isolated; simultaneously switching the fault phase from a three-level operation mode to a two-level operation mode; when the four-quadrant pulse rectifier 11 is a single vertical bridge arm switch tube S x1 、S x4 Firstly, a fault isolation circuit of the phase is utilized to isolate a fault bridge arm and trigger a bidirectional controllable thyristor T in a rectifying side fault-tolerant bridge 22 at the same time when a fault occurs x Conducting, so that the redundant bridge arm 21 runs in a normal three-level state instead of the fault bridge arm, and in the step 2), x is equal to a or b;
3) If the x-phase bridge arm switching tube S of the four-quadrant pulse rectifier 11 is detected x2 、S x3 And y-phase vertical bridge arm switch tube S y1 、S y4 After the X-phase horizontal bridge arm switching tube and the Y-phase vertical bridge arm switching tube are failed at the same time, the switching tube S in the X-phase horizontal bridge arm is turned off x2 And S is x3 Is a trigger pulse signal of (1)The number is that the fault bridge arm is isolated, so that the y phase operates in a two-level mode, meanwhile, the fault bridge arm is isolated by utilizing a fault isolation circuit of the y phase bridge arm, and meanwhile, a bidirectional controllable thyristor T in the rectifying side fault-tolerant bridge 22 is triggered y Conducting to enable the redundant bridge arm 21 to replace a fault bridge arm to operate in a normal three-level state; if the x-phase bridge arm switching tube S of the four-quadrant pulse rectifier 11 is detected x2 、S x3 And y-phase bridge arm switching tube S x2 、S x3 Simultaneously, the fault occurs, and the switching tube S in the X-phase transverse bridge arm is turned off x2 And S is x3 And a switching tube S in a y-phase cross arm y2 And S is y3 Isolating the fault bridge arm to enable the x and y phases to operate in a two-level mode, wherein in the step 3), x and y are simultaneously equal to a or simultaneously equal to b;
4) If a single bridge arm switching tube S of the inverter 13 is detected x2 、S x3 The switching tube S in the phase transverse bridge arm is immediately turned off when a fault occurs x2 And S is x3 The trigger pulse signals of the bridge arm are isolated; after fault isolation, switching the fault phase from a three-level operation mode to a two-level operation mode; if the inverter 13 is a single vertical bridge arm switch tube S x1 、S x4 Failure occurs to immediately turn off the phase switching tube S x1 And S is x4 Simultaneously controlling the switching tube S in the transverse bridge arm x2 And S is x3 Conducting all the time, connecting the fault phase to the midpoint of the direct current bus, wherein the output voltage of the x phase is zero level at the moment, and in the step 4), x is equal to u, v or w;
5) When detecting the switching tube S of the middle cross arm of the X-phase arm of the inverter 13 x2 、S x3 And a vertical bridge arm switch tube S x1 、S x4 Firstly, a fault isolation circuit of the phase is utilized to isolate a fault bridge arm and trigger a bidirectional controllable thyristor T in an inversion side fault-tolerant bridge 23 at the same time when a fault occurs x Conducting, so that the redundant bridge arm 21 runs in a normal three-level state instead of the fault bridge arm, and in the step 5), x is equal to u, v or w;
6) When detecting the x-phase bridge arm switch tube S of the inverter 13 x2 、S x3 And y-phase vertical bridge arm switch tube S y1 、S y4 At the same time happenBarrier for switching off switching tube S in X-phase bridge arm x2 And S is x3 Is turned off by the trigger pulse signal of y phase S y1 And S is y4 Simultaneously controlling a switching tube S in a y-phase bridge arm y2 And S is y3 Conducting all the time; operating the x-phase in a two-level mode and the y-phase output voltage being zero, in step 6), x and y being equal to u simultaneously, v simultaneously, or w simultaneously;
7) When detecting the x-phase bridge arm switch tube S of the inverter 13 x2 、S x3 And y-phase bridge arm switching tube S x2 、S x3 Simultaneously, the fault occurs, and the switching tube S in the X-phase transverse bridge arm is turned off x2 And S is x3 And a switching tube S in a y-phase cross arm y2 And S is y3 Isolating the fault bridge arm, and controlling the x and y phases to operate in a two-level mode, wherein in the step 7), x and y are simultaneously equal to u, or simultaneously equal to v, or simultaneously equal to w.
As shown in fig. 6, the fault-tolerant control result of the u-phase vertical bridge arm switching tube of the inverter 13 is shown in the case of detecting S u1 After the fault occurs, the fault phase outputs zero level through the switch state and vector reconstruction, and the v and w phase bridge arms operate in a three-level mode, the inverter 13 outputs three-phase symmetrical line voltage and current waveforms, and the maximum amplitude is in a normal mode
As shown in fig. 7, the fault-tolerant control result of the u-phase bridge arm switching tube of the inverter 13 is shown in S u2 When the fault occurs, the switch tube S is turned off u2 And S is u3 The fault phase operates in a two-level mode, the v-phase bridge arm and the w-phase bridge arm operate in a three-level mode, three-phase symmetrical line voltage and current waveforms are output, and the maximum amplitude of the line voltage and current waveforms is the same as that of the normal mode.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The main circuit (1) comprises a four-quadrant pulse rectifier (11), a middle direct current circuit (12) and an inverter (13) which are sequentially connected in series, and is characterized by further comprising a redundant circuit (2) and a fault isolation component (3), wherein the four-quadrant pulse rectifier (11) is of a single-phase three-level T-type pulse rectifier topological structure; the inverter (13) is of a three-phase three-level T-type inverter topological structure; the fault isolation components (3) are distributed in the four-quadrant pulse rectifier (11) and the bridge arm of the inverter (13); the redundant circuit (2) is electrically connected with the four-quadrant pulse rectifier (11), the intermediate direct current circuit (12) and the inverter (13);
the redundant circuit (2) comprises a single-phase redundant bridge arm (21), a rectifying side fault-tolerant bridge (22) and an inverting side fault-tolerant bridge (23);
the single-phase redundant bridge arm (21) is of a three-level T-shaped topological structure and comprises a switching tube S 1 Switch tube S 2 Switch tube S 3 Switch tube S 4 The switch tube S 1 The collector electrode of the switch tube S is connected with the P end of the positive direct current bus 1 Emitter and switching tube S of (C) 4 Collector and switching tube S 2 Emitter connection, switch tube S 4 The emitter of the switch tube S is connected with the N end of the negative direct current bus 2 Collector and switching tube S of (2) 3 Collector connection of (S) switch tube 3 The emitter of (a) is connected to the middle point O of the direct current bus;
the rectifying side fault tolerant bridge (22) comprises a bidirectional controllable thyristor T a And a bidirectional controllable thyristor T b Bidirectional controllable thyristor T a One end of the (B) is connected to the A end of the single-phase alternating current bus, and the bidirectional controllable thyristor T b Is connected to the B end of the single-phase alternating current bus, and is a bidirectional controllable thyristor T a Is provided with a bidirectional controllable thyristor T b The other ends of (a) are connected to a switch tube S 1 An emitter of (a);
the inverter-side fault-tolerant bridge (23) comprises a bidirectional controllable thyristor T u Bidirectional controllable thyristor T v And a bidirectional controllable thyristor T w The bidirectional controllable thyristor T u One end of the bidirectional controllable thyristor T v One end of the bidirectional controllable thyristor T w Is connected to the switch tube S at one end 1 The emitter of the bidirectional controllable thyristor T u Is arranged at the other end of the bidirectional controllable thyristor T v Is arranged at the other end of the bidirectional controllable thyristor T w The other end of the three-phase alternating current output circuit is respectively connected to a three-phase alternating current output U end, a three-phase alternating current output V end and a three-phase alternating current output W end.
2. The fault tolerant traction converter main circuit of a high speed train according to claim 1, characterized in that the fault isolation assembly (3) is a number of fuses.
3. The main circuit of the fault-tolerant traction converter of the high-speed train according to claim 2, characterized in that the four-quadrant pulse rectifier (11) comprises two three-level T-legs, the three-level T-legs comprising an upper leg, a lower leg and a transverse leg;
the upper bridge arm of the four-quadrant pulse rectifier (11) comprises a switching tube S a1 Fast fuse F ap Switch tube S b1 Fast fuse F bp Wherein the switching tube S a1 Collector of (d) and fast fuse F ap One end is connected with a quick fuse F ap The other end of the switch tube S is connected to the end of the positive direct current bus P a1 The emitter of (a) is connected to the A end of the single-phase alternating current bus, and the switch tube S b1 Collector of (d) and fast fuse F bp Is connected with one end of a fast fuse F bp The other end of the switch tube S is connected to the end of the positive direct current bus P b1 The emitter of (a) is connected to the B end of the single-phase alternating current bus;
the lower bridge arm of the four-quadrant pulse rectifier (11) comprises a switching tube S a4 Fast fuse F an Switch tube S b4 Fast fuse F bn Wherein the switching tube S a4 The collector of (a) is connected to the A end of the single-phase alternating current bus, and the switch tube S a4 Emitter and fast fuse F of (2) an Is connected with one end of a fast fuse F an The other end of the switch tube S is connected to the N end of the negative direct current bus b4 The collector of (2) is connected to the B end of the single-phase alternating current bus, and the switch tube S b4 Emitter and fast fuse F of (2) bn Is connected with one end of a fast fuse F bn The other end of the negative direct current bus is connected to the N end of the negative direct current bus;
the cross arm of the four-quadrant pulse rectifier (11) comprises a switching tube S a2 Fast fuse F ao Switch tube S a3 Switch tube S b2 Switch tube S b3 Fast fuse F bo Wherein the switching tube S a2 Emitter and fast fuse F of (2) ao Is connected with one end of a fast fuse F ao The other end of the switch tube S is connected to the A end of the single-phase alternating current bus a2 Collector and switching tube S of (2) a3 Collector connection of (S) switch tube a3 The emitter of (2) is connected to the middle point O of the DC bus, and the switch tube S b2 Emitter and fast fuse F of (2) bo Is connected with one end of a fast fuse F bo The other end of the switch tube S is connected to the B end of the single-phase alternating current bus b2 Collector and switching tube S of (2) b3 Collector connection of (S) switch tube b3 The emitter of (a) is connected to the middle point O of the direct current bus;
the fast fuse F ap Said fast fuse F bp Said fast fuse F an Said fast fuse F bn Said fast fuse F ao The fast fuse F bo Are included in the fault isolation assembly (3).
4. A main circuit of a fault-tolerant traction converter of a high-speed train according to claim 3, characterized in that the inverter (13) comprises three-level T-legs, comprising an upper leg, a lower leg and a transverse leg;
the upper bridge arm of the inverter (13) comprises a switch tube S u1 Fast fuse F up Switch tube S v1 Fast fuse F vp Switch tube S w1 Fast fuse F wp Wherein the switching tube S u1 Collector of (d) and fast fuse F up Is connected with one end of a fast fuse F up The other end of the switch tube S is connected to the end of the positive direct current bus P u1 The emitter of (a) is connected to the three-phase alternating current output U end, and the switch tube S v1 Collector of (d) and fast fuse F vp Is connected with one end of a fast fuse F vp The other end of the switch tube S is connected to the end of the positive direct current bus P v1 The emitter of (2) is connected to the three-phase alternating current output V end, and the switch tube S w1 Collector of (d) and fast fuse F wp Is connected with one end of a fast fuse F wp The other end of the switch tube S is connected to the end of the positive direct current bus P w1 The emitter of (a) is connected to the W end of the three-phase alternating current output;
the lower bridge arm of the inverter (13) comprises a switch tube S u4 Fast fuse F un Switch tube S v4 Fast fuse F vn Switch tube S w4 Fast fuse F wn Wherein the switching tube S u4 The collector of (2) is connected to the three-phase alternating current output U end, and the switch tube S u4 Emitter and fast fuse F of (2) un Is connected with one end of a fast fuse F un The other end of the switch tube S is connected to the N end of the negative direct current bus v4 The collector of (2) is connected to the three-phase AC output V terminal, the switch tube S v4 Emitter and fast fuse F of (2) vn Is connected with one end of a fast fuse F vn The other end of the switch tube S is connected to the N end of the negative direct current bus w4 The collector of (2) is connected to the three-phase AC output W end, and the switch tube S w4 Emitter and fast fuse F of (2) wn Is connected with one end of a fast fuse F wn The other end of the negative direct current bus is connected to the N end of the negative direct current bus;
the bridge arm of the inverter (13) comprises a switching tube S u2 Fast fuse F uo Switch tube S u3 Quick fusingF device vo Switch tube S v2 Switch tube S v3 Switch tube S w2 Switch tube S w3 Fast fuse F wo Wherein the switching tube S u2 Emitter and fast fuse F of (2) uo Is connected with one end of a fast fuse F uo The other end of the switch tube S is connected to the three-phase alternating current output U end u2 Collector and switching tube S of (2) u3 Is connected with the collector of the switch tube S u3 The emitter of (2) is connected to the middle point O of the DC bus, and the switch tube S v2 Emitter and fast fuse F of (2) vo Is connected with one end of a fast fuse F vo The other end of the switch tube S is connected to the three-phase alternating current output V end v2 Collector and switching tube S of (2) v3 Is connected with the collector of the switch tube S v3 The emitter of (2) is connected to the middle point O of the DC bus, and the switch tube S w2 Emitter and fast fuse F of (2) wo Is connected with one end of a fast fuse F wo The other end of the switch tube S is connected to the three-phase alternating current output W end w2 Collector and switching tube S of (2) w3 Collector connection of (S) switch tube w3 The emitter of (a) is connected to the middle point O of the direct current bus;
the fast fuse F up Said fast fuse F vp Said fast fuse F wp Said fast fuse F un Said fast fuse F vn Said fast fuse F wn Said fast fuse F uo Said fast fuse F vo And the fast fuse F wo Is included in the fault isolation assembly (3).
5. The main circuit of a fault-tolerant traction converter of a high-speed train according to claim 4, characterized in that said intermediate direct current circuit (12) comprises an electrolytic capacitor C connected in series d1 And an electrolytic capacitor C d2 Electrolytic capacitor C d1 The positive terminal of (C) is connected with the positive DC bus P terminal, and the electrolytic capacitor C d1 The negative polarity end of (C) is connected to the middle point O of the direct current bus, and the electrolytic capacitor C d2 Is connected to the middle point of the DC busO point, electrolytic capacitor C d2 Is connected with the negative polarity end of the negative direct current bus N.
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| EP3975401A1 (en) * | 2020-09-29 | 2022-03-30 | Fundació Institut de Recerca en Energia de Catalunya (IREC) | Fault-tolerant dc-ac electric power conversion device |
| CN216649232U (en) * | 2021-01-19 | 2022-05-31 | 华为数字能源技术有限公司 | Fault protection device and photovoltaic power generation system |
| BR112022001041A2 (en) | 2021-01-19 | 2022-10-18 | Huawei Digital Power Tech Co Ltd | PHOTOVOLTAIC ENERGY GENERATION SYSTEM, AND METHOD TO CONTROL FAILURE PROTECTION DEVICES |
| CN113271028B (en) * | 2021-06-03 | 2022-05-17 | 山东大学 | Prediction control method for reconstructing neutral point balance of topology after three-level inverter fault |
| CN113922685B (en) * | 2021-10-13 | 2022-06-17 | 浙江大学 | Fault-tolerant modulation method for single-phase T-type three-level H-bridge-based cascaded solid-state transformer |
| CN114024319A (en) * | 2021-11-16 | 2022-02-08 | 国网湖南省电力有限公司 | Three-phase voltage treatment method and system |
| CN116565927B (en) * | 2023-07-12 | 2023-10-20 | 锦浪科技股份有限公司 | Battery energy storage system with fault tolerance function |
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